Under Jordanian law, the five are allowed to appeal the conviction and the sentence.

Attacks attributed to Abu Nidal

1985: Attacks at Rome and Vienna airports in December 1985

1986: Attacks on the Neve Shalom synagogue in Istanbul, and the hijacking of Pan Am Flight 73 hijacking in Karachi

1988: Attack on the City of Poros day-excursion ship in the Mediterranean, and a bombing of a hotel in Khartoum

1991: Suspected of assassinating PLO deputy chief Abu Iyad

1994: Assassinated a Jordanian diplomat in Lebanon

Abu Nidal broke off from the Palestine Liberation Organisation, headed by Yasser Arafat, in the 1970s.

He now heads the Fatah Revolutionary Council, which is suspected of carrying out a series of attacks in Europe and the Middle East in an attempt to undermine peace efforts between Arab states and Israel.

The group has been described by the US State Department as "the most dangerous terrorist organisation in existence."

America says the group is responsible for about 300 deaths, but that it has been much less active in recent years due to a shortage of funds.

Whereabouts unknown

Abu Nidal's whereabouts are not known for certain, but he is believed to be in Iraq.

A statement by the court said the five convicted men were accused of "conspiracy to carry out a terrorist activity that led to the death of an individual, as well as membership in an illegal group."

They were also "sentenced to death by hanging," according to the statement.

The three others convicted in absentia were Uqab Nimer Al-Faqha, also known as Izzeddine Nimer, who lives in Iraq; Jamal Darwish, also known as Rashed Attiyah, who lives in Libya; and Ihsan Sadiq al-Rathwan who lives in the West Bank.